Grinding machine



. W. WORTH GRINDING MACHINE.

APPLICATION FILED MAY E0, 1920.

Patented Sept. 19, 1922..

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INVENTOR EDMUND W- WORTH ATTORNEYS E. W. WORTH.

GRINDING MACHINE.

APPLICATION FILED MAYIO, I920.

1,429,819. PatentedSept. 19,1922.

2 SHEETSSHEET 2 E2 INVENTOR EDMUND W WORTH ATTORNEYS Patented Sept. 1%, 1922.

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EDMUND WALTER WORTH, 0F SOUTHBRIDGE, MASSACHUSETTS, ASSIGNOR 'IO AMER- ICAN OPTICAL COMPANY, OF SOUTHBRIDGE, 'MASSACHUSETTS, A VOLUNTARY ASSOCIATION OF llIASS.ALCH JSE'JTI.Sv

GRINDING MACHINE.

Application filed May 10,

' To a whom it may concern:

Be it known that I, EDMUND \VORTH, a citizen of the United States, residing at Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Grinding Machines, of which the following is a specification.

This invention relates to improvements in grinding machines and has particular reference to a novel and improved construction of machine particularly adapted for use in the grinding of ophthalmic lenses The principal object of the present invention is the provision of a novel and improved construction of machine embodying a plurality of tool bearing spindles adapted to operate upon different port-ions of an ophthalmic lens simultaneously.

A further object of the invention is the provision of an improved construction of machine particularly adapted for use in connection with bifocal lenses formed from a single piece of glass in which independ-- ently operable means shall be employed for operating on both the distance and reading portions of the lens blank simulta neously.

Other objects and advantages of my improved construction should be readily apparent by reference to the following specification taken in connection with the accom panying drawings, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure 1 represents a front view of a machine embodying my improvements.

Figure II represents a side elevation thereof.

Figure 111 represents a plan view of the construction shown in Figure I.

Figure IV represents a sectional view through a slightly modified construction of machine.

In the drawings, the numeral 1 designates the bench or table forming a support for my improved machine and having suitably mounted thereon and preferably depending therethrough the lower driven spindle 2 for Serial No. 380,093.

.with a central portion a of one focus and an outer portion 43 of a. different focus. It is the intention of my present invention, however, to provide mechanism whereby the two surfaces are treated by tools mounted entirely ii'idependei'it one of the other, entirely adjustable, having independent pressure control means and the like, so that the two operations are entirely independent of each other but at the same time are simultaneously performed. This result I attain by my improved form of grinding mechanism, which as illustrated in Figures I and 11 comprises the uprights or supports 5 which are mounted. for in and out adjustment on the table 1 through the medium of the adjusting devices 6 or equivalent structures and which have slidably mounted in the upper portions thereof the arms 7 bearing the crossmcmhe'r 8, which as illustrated is angularly adjustable within its supporting arm 7. This angular adjustment may be inade by the cut and try method, or in connection with. a protractor as shown at 9 carried by one of the arms and cooperating with the pointer or indicator 1.0 of the cross piece 8, suitable lock screws or other mechanism 11 securing the cross piece 8 in desired angularly adjusted position. In any event the cross piece is preferably provided with a suitable thrust bearing 12 receiving the minor portion-spindle l3 driven as by the belt 14: passing around its pulley 15. This spindle bears at its lower end a tool 16 for operation on the portion t of the lens blank as illustrated.

It will thus be seen that on account of the movement of the guides 5 and the angl ng of the cross piece 8 it is possible to position the spindle 13 at any desired angle andany desired in and out adjustment, this adjustment being accomplished at one or both sldes ,of the machine, as may be preferred. This is possible for the reason that ordinarily but slight in and out adjustment is required,

in that the parts will be set at a certain position for the production of a standard s ze portion a and but slight varlations 1n or1g for by this adjustment, these features being small enough so that adjustment of but one side will take care of them, although the double adjustment is provided in order that different sizes may be taken care of satisfactorily by the machine. To properly .feed the tool 16 in the direction of the glass blank 4 any desired and well known teed mechanism may be employed but I preferably accomplish this result by mounting on the cross member 8 the loose sleeves 17 connected to the weights 18 as by wires or other suitable connections 19. The advantage of this particular type of pressure mechanism is that it permits of desired angular adjustment-of the cross piece 8 and spindle 13 without in. anywise interfering with the in and out vertical or other adjustments and still maintains a constant pressure which may, of course, be varied by adding to or subtracting from the Weights employed.

At the same time that I make use of this improved center mechanism I also employ suitable mechanism for abrading on the outer portion 1*, which mechanism may comprise the tool 20 having its spindle 21 journaled in the head 22 on the pivoted arm 23, said head being angularly adjustable as about the point 241 and the spindle being driven by a belt 25 passing around the pulley 26 on the spindle. Suitable weight connection 27 and weight 28 serve at the same time to impel this spindle toward the work, this pressure being independent of that applied. to the central portion, with the resultthat the two may be simultaneously operated or either thrown temporarily out of operation, or the pressure of the two modified or varied in accordance with the progress of the work, but a single worker being able to care for a number of these simultaneously operating machines.

In Figure IV. I have shown a slight modification in which in place of the cross memher 8 I have the swinging arm 29 pivoted to the adjustable block 30 on the table 1, the arm 29 extendingover the lens blank and bearing the adjustable cross member 31, while a weight secured at the forward end of the arm in this instance affords the pressure, the general operation of the parts being otherwise the same as hitherto described.

spect to'its support, and means for indicating the amount of angular adjustment of said spindle. i

2. In a device of the character described, the combination with a base, of a pair of slides mounted for horizontal movement on the base, upright supports telescopingwith the slides, means connecting the pair of sup ports, said means being'angularly adjustable with respect to the supports, a spindle car ried by said angularly adjustable means, and means for locking the parts and spindle in desired angularly adjusted relation with respect to the telescoping supports.

' 3. In a device of the'character described, I

the combination with a base, of a pair of slides mounted for horizontal movement on the base, upright supports telescoping with the slides, means connecting the pair of supports, said means being angularly adjustable with respect to the supports, a spindle carried by said angularly adjustable means, means for locking the parts and spindle in desired angularly adjusted relation with respect to the telescoping supports, and i'rileans for indicating such angular relations 1p.

4. In a device of the character described, the combination with a base, of a pair of slides mounted for horizontal movement on the base, upright supports telescoping with the slides, means connecting the pair of supports, said means being angularly adjustable with respect to the supports, a spindle carried. by said angularly adjustable means, means for locking the parts and spindle in desired angularly adjusted relation with respect: to the telescoping supports, and means for moving the spindle support and associated parts in the direction of the base.

In testimony whereof I have affixed my signature, in presence of two witnesses.

EDMUND VVALTER WORTH.

Witnesses:

Amen G. HASKELL, ESTHER M.- LAFLER, 

